/*******************************************************************************
 * Copyright 2011 Mauro Luigi Drago (drago.luigi@gmail.com)
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *******************************************************************************/
package com.bytenose.extrautils.caching;

import java.lang.ref.WeakReference;
import java.util.WeakHashMap;

/**
 * A cache of objects using {@link WeakReference}s to store keys.
 * @author Mauro Luigi Drago
 * 
 * @param <K> the type of the keys.
 * @param <V> the type of the values.
 */
public class WeakCache<K, V>
	extends WeakHashMap<K, V>
	implements ICache<K, V> {
	
	/**
	 * Creates a new {@link WeakCache}.
	 */
	public WeakCache() {
	}
	
	/**
	 * Create a new {@link WeakCache}.
	 * @param <K> the type of the keys.
	 * @param <V> the type of the values.
	 * @return the cache.
	 */
	public static <K,V> WeakCache<K, V> newInstance() {
		return new WeakCache<K, V>();
	}
}
